深圳市中立信电子科技有限公司

NCP1252ADR2G

开关控制器 CURR MDE PWM CNTRLR FWD FLYBCK APPS

Current Mode PWM  Controller for Forward and  Flyback Applications

The NCP1252ADR2G NCP1252 controller offers everything needed to build cost−  effective and reliable ac−dc switching supplies dedicated to ATX  power supplies. Thanks to the use of an internally fixed timer,  NCP1252 detects an output overload without relying on the auxiliary  Vcc. A Brown−Out input offers protection against low input voltages  and improves the converter safety. Finally a SOIC−8 package saves  PCB space and represents a solution of choice in cost sensitive project.

NCP1252ADR2G Features

• Peak Current Mode Control

• Adjustable Switching Frequency up to 500 kHz

• Jittering Frequency ±5% of the Switching Frequency

• Latched Primary Over Current Protection with 10 ms Fixed Delay

• Delay Extended to 150 ms in E Version

• Delayed Operation Upon Start−up via an Internal Fixed Timer (A, B and C versions only)

• Adjustable Soft−start Timer

• Auto−recovery Brown−Out Detection

• UC384X−like UVLO Thresholds

• Vcc Range from 9 V to 28 V with Auto−recovery UVLO

NCP1252ADR2G Typical Applications

• Power Supplies for PC Silver Boxes, Games Adapter...

• Flyback and Forward Converter